Göbel B., Schäffer A.F., Berakdar J., Mertig I., Parkin S.S.P.

A magnetic skyrmionium (also called 2π-skyrmion) can be understood as a skyrmion?a topologically nontrivial magnetic whirl?which is situated in the center of a second skyrmion with reversed magnetization. Here, we propose a new optoelectrical writing and deleting mechanism for skyrmioniums in thin films, as well as a reading mechanism based on the topological Hall voltage. Furthermore, we point out advantages for utilizing skyrmioniums as carriers of information in comparison to skyrmions with respect to the current-driven motion. We simulate all four constituents of an operating skyrmionium-based racetrack storage device: creation, motion, detection and deletion of bits. The existence of a skyrmionium is thereby interpreted as a ?1? and its absence as a ?0? bit.

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